EP2620269A1 - Prepreg pasting state inspection apparatus - Google Patents
Prepreg pasting state inspection apparatus Download PDFInfo
- Publication number
- EP2620269A1 EP2620269A1 EP13153052.9A EP13153052A EP2620269A1 EP 2620269 A1 EP2620269 A1 EP 2620269A1 EP 13153052 A EP13153052 A EP 13153052A EP 2620269 A1 EP2620269 A1 EP 2620269A1
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- EP
- European Patent Office
- Prior art keywords
- unit
- adjusting
- prepregs
- pasting
- inspection apparatus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000007689 inspection Methods 0.000 title claims abstract description 30
- 238000003384 imaging method Methods 0.000 claims abstract description 44
- 238000005259 measurement Methods 0.000 claims description 14
- 230000000717 retained effect Effects 0.000 claims description 2
- 238000010030 laminating Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C11/00—Photogrammetry or videogrammetry, e.g. stereogrammetry; Photographic surveying
- G01C11/02—Picture taking arrangements specially adapted for photogrammetry or photographic surveying, e.g. controlling overlapping of pictures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/38—Automated lay-up, e.g. using robots, laying filaments according to predetermined patterns
- B29C70/386—Automated tape laying [ATL]
- B29C70/388—Tape placement heads, e.g. component parts, details or accessories
Definitions
- the present invention relates to improvement in a technique for inspecting a prepreg pasting state.
- laminated bodies of prepreg for example, carbon prepreg
- fuselages of automobiles and airplanes are used in fuselages of automobiles and airplanes.
- the prepreg laminated bodies are constituted so that a plurality of prepregs is arranged in parallel on pasting target bodies by using a laminating apparatus.
- the pasting target bodies are usually molds or prepreg laminated bodies laminated on the molds.
- Patent Document 1 discloses that while light is being emitted obliquely to side ends (edge portions on sides where the gaps to be inspected are formed) of adjacent fiber-reinforced plastic tapes (corresponding to prepregs), the side ends are imaged by cameras, and distances between the edges are detected based on the obtained image data, and the states of the gaps are determined.
- Patent Document 1 JP 2011-104905 A
- a laminating apparatus 1 is provided with a laminating head 11, and a pasting roller 12 that is integral with the laminating head 11. While the laminating head 11 is being moved along a pasting target body 3, prepregs 4 are sequentially pasted to the pasting target body 3 by the pasting roller 12.
- the laminating apparatus 1 is provided with a pasting state inspection apparatus 2 having a laser 21 as an illumination unit and a camera 22 as an imaging unit.
- the laser 21 and the camera 22 move integrally with the laminating head 11.
- the inspection using the pasting state inspection apparatus 2 is carried out on a prepreg 4 which is being pasted and adjacent pasted prepreg 4.
- the inspection may be carried out on the adjacent prepreg 4 that has been pasted.
- the laser (the line laser) 21 emits slit light LA along an inclined plane so that a pattern X of the slit light LA are formed across the adjacent prepregs 4.
- the projected pattern X is composed of projected lines L1 to L3.
- a level difference facing a longitudinal direction of the prepregs is formed between the projected lines L1 and L2 formed on the prepregs 4 and the projected line L3 formed on the pasting target body 3 corresponding to the gap G.
- the size of the level difference depends on a thickness of the prepregs 4 and an incident angle of the slit light LA.
- a distance A of the gap G detected based on the image data is within an allowance, so that the pasting states of the prepregs 4 can be accurately inspected. For example, when the gap distance A is within the allowance, the pasting of the prepregs 4 continues, and when not, the pasting of the prepregs 4 is suspended.
- the slit light LA is emitted so that the projected lines L1 to L3 are formed along a direction perpendicular to a longitudinal direction of the prepregs 4.
- the pasting target body 3 is composed of not only a plane portion 31 but often of a curved portion 32 according to a shape of a tail unit of an airplane or the like as shown in Figs. 1A and 1B .
- a shape changed portion such as the curved portion 32 is present, this causes an adverse effect on the imaging state of the camera 22, and thus the inspection accuracy in the pasting states of the prepregs 4 is deteriorated.
- a technical problem of the present invention is to accurately inspect pasting states of prepregs even when a pasting target body to which prepregs are pasted has a shape changed portion such as a curved portion.
- the present invention that is devised in order to solve the above problem is a prepreg pasting state inspection apparatus, for inspecting a gap between prepregs adjacent on a pasting target body having a shape changed portion, including an irradiation unit for emitting slit light along an inclined plane so that a projected pattern of the slit light is formed across the adjacent prepregs, an imaging unit for imaging an irradiation region of the irradiation unit, a determination unit for determining whether the gap between the adjacent prepregs is within an allowance based on a signal from the imaging unit, a distance measurement unit for measuring a distance between a reference position and the irradiation region, and a focus adjusting unit for adjusting a focus position of the imaging unit based on the signal from the distance measurement unit.
- the distance measurement unit measures a distance from the reference position to the irradiation region (for example, surfaces of the prepregs, or a surface of the pasting target body corresponding to the gap between the prepregs). For this reason, when the focus adjusting unit successively adjusts the focus position of the imaging unit, even if the shape changed portion is present in the pasting target body, the projected pattern formed across the adjacent prepregs can be accurately imaged and the gap between prepregs adjacent can be accurately detected. Therefore, the pasting states of the prepregs can be accurately inspected.
- the imaging unit may have a movable lens that is capable of moving close to or separating from the irradiation region
- the focus adjusting unit may have a driving unit for moving the movable lens based on the signal from the distance measurement unit.
- a focus position of the imaging unit can be easily adjusted according to movement of the movable lens.
- the focus position of the imaging unit may be adjusted.
- the driving unit is an ultrasonic motor.
- the focus position of the imaging unit can be adjusted finely and quickly. Further, the apparatus can be miniaturized.
- the above constitution has a second focus adjusting unit for adjusting a focus position of the irradiation unit based on a signal from the distance measurement unit.
- the focus position of the irradiation unit is adjusted like the above constitution.
- the irradiation unit is retained in a moving body that can move close to or separate from the irradiation region, and the second focus adjusting unit has a second driving unit for moving the moving body based on a signal from the distance measurement unit.
- the second driving unit is an ultrasonic motor.
- the focus position of the irradiation unit is adjusted finely and quickly, and the apparatus can be miniaturized.
- the above constitution has a light amount adjusting unit for adjusting an amount of light incident on the imaging unit.
- the imaging unit can always observe an approximately same amount of light, so-called blown out highlights (overexposed state) can be prevented from occurring on data observed by the imaging unit due to an excessive amount of light. For this reason, the gap distance between the adjacent prepregs can be stably measured.
- a constitution is effective for the case where the shape changed portion is present in the pasting target body. This is because a direction of reflection light (for example, total reflection light) of light emitted from the irradiation unit changes on the shape changed portion, and the amount of light incident on the imaging unit is likely to fluctuate.
- the light amount adjusting unit is composed of at least one of an output adjusting unit for adjusting an output of the slit light emitted from the irradiation unit, a shutter speed adjusting unit for adjusting a shutter speed of the imaging unit, and an iris adjusting unit for adjusting an iris of the imaging unit.
- (1) to (3) are suitably combined so that the constitution is compatible with the fluctuation in the amount of light more securely.
- the above constitution is provided with a depth of field adjusting unit for adjusting a depth of field of the imaging unit.
- the depth of field adjusting unit examples include the iris of the imaging unit (for example, an electromotive iris), and a zoom mechanism (for example, electromotive zoom) if it is provided to the imaging unit.
- the iris for example, an electromotive iris
- a zoom mechanism for example, electromotive zoom
- the pasting states of the prepregs can be accurately inspected.
- a prepreg pasting state inspection apparatus 2 is provided with a laser 21 as an irradiation unit, a camera 22 as an imaging unit for imaging an irradiation region of the laser 21, a control unit 24 as a determination unit for determining whether a gap S (gap distance A) between adjacent prepregs 4 is within an allowance based on a signal from the camera 22, and a range sensor 23 as a distance measurement unit for measuring a distance from a reference position to the irradiation region.
- the drawing for convenience, illustrates the camera 22 and the range sensor 23 being adjacent to each other in a pasting advancing direction of the prepregs 4. Actually, however, both of them are arranged adjacently in a direction perpendicular to the pasting advancing direction of the prepregs 4, in other words, a widthwise direction of the prepregs 4 as shown in Fig. 5 .
- a light wave type or sound wave type range sensor can be employed as the range sensor 23.
- a difference between the distance measured by the range sensor 23 and an actual distance from the camera 22 to the irradiation region is given in advance as a correction function.
- a difference between the distance measured by the range sensor 23 and an actual distance from the laser 21 to the irradiation region is given in advance as a correction function.
- the irradiation unit is not limited to the laser 21, and thus illumination such as LED for emitting incoherent light can be employed.
- the control unit 24 is provided with a first focus adjusting unit 25 for adjusting a focus position of the camera 22 based on a measurement signal from the range sensor 23, and a second focus adjusting unit 26 for adjusting a focus position of the laser 21 based on the measurement signal from the range sensor 23.
- the camera 22 contains a motor (for example, an ultrasonic motor) 27 for moving a movable lens, not shown, back and forth with respect to an optical axis direction.
- a motor for example, an ultrasonic motor
- the laser 21 is mounted to a moving body 29 that moves up and down on a rail 28 extending to an up-down direction.
- the moving body 29 is driven by a motor, not shown (for example, an ultrasonic motor).
- the moving body 29 may be supported at a forward end of a cylinder expanding and contracting in the up-down direction.
- the first focus adjusting unit 25 drives a motor 27 built in the camera 22 based on the distance measured signal input from the range sensor 23, and moves the movable lens of the camera 22 back and forth in the optical axis direction. As a result, the focus position of the camera 22 is automatically adjusted according to the distance measured signal from the range sensor 23.
- a second focus adjusting unit 26 drives a motor connected to the moving body 29 based on the distance measured signal input from the range sensor 23 so as to move the laser 21 back and forth integrally with the moving body 29. As a result, the focus position of the laser 21 is automatically adjusted according to the distance measured signal from the range sensor 23.
- the prepreg pasting state inspection apparatus 2 is different from the first embodiment in that a light amount adjusting unit for adjusting an amount of light incident on the camera 22, and a depth of field adjusting unit for adjusting a depth of field of the camera 22 are provided. Only that different point will be described below.
- the light amount adjusting unit is composed of at least one of an output adjusting unit for adjusting the output of the slit light emitted from the laser 21, a shutter speed adjusting unit for adjusting the shutter speed of the camera 22, and an iris adjusting unit for adjusting the iris of the camera.
- the light amount adjusting unit adjusts the amount of light incident on the camera 22 so that the amount of light becomes approximately constant.
- the depth of field adjusting unit is composed of at least one of the iris adjusting unit for adjusting the iris of the camera, and a zoom adjusting unit for adjusting a zoom of the camera. Even if the shape of the pasting target body 3 changes, the depth of field adjusting unit adjusts the depth of field of the camera 22 so that the projected lines L1 to L3 can be clearly observed.
- the light amount adjusting unit and the depth of field adjusting unit change the adjusting amounts in the following manner, for example.
- the adjusting amounts by means of the light amount adjusting unit and the depth of field adjusting unit are stored in advance according to a tilt angle ⁇ of the pasting target body 3.
- the tilt angle ⁇ is set to an angle that is formed by a line segment P1P2 and a horizontal line.
- P1 is an intersection point between a perpendicular line drawn from the camera 22 and surface of the pasting target body 3 (or the prepregs 4).
- P2 is a lowest point on an outer periphery of the pasting roller 12.
- M and L are known in advance.
- ⁇ becomes zero.
- ⁇ since L - L1 is more than zero, ⁇ obtains a positive value.
- ⁇ since L - L1 is less than zero, ⁇ obtains a negative value.
- a tilting direction of the pasting target body 3 can be determined based on the positive or negative value of ⁇ .
- the light amount adjusting unit narrows down the light amount and adjusts the amount of light so that it is approximately maintained in the same level in all the states of Figs. 6A to 6C .
- the depth of field adjusting unit sets the depth of field as deep as possible so that the projected lines L1 to L3 (see Fig. 2 ) of the slit light can be clearly observed in the states of Figs. 6A to 6C .
- the depth of field is constant in Figs. 6A to 6C , but the depth of field may be changed according to the change in ⁇ .
- the prepregs 4 are pasted to the first pasting target body 3 at a low speed of, for example, about 0.5 m/s (half of the normal pasting speed).
- a relationship between ⁇ and the adjusting amounts by means of the light amount adjusting unit and the depth of field adjusting unit is stored (recording (teaching) step).
- the light amount adjusting unit and the depth of field adjusting unit are operated in the basis of the adjusting amounts stored in advance.
- NC numerical value control
- the present invention is not limited to the above embodiments and can be carried out in various forms.
- the first embodiment describes the case where the movable lens of the camera 22 is moved, but the entire camera 22 may be slid to the optical axis direction so that the focus position is adjusted.
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- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Moulding By Coating Moulds (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
Description
- The present invention relates to improvement in a technique for inspecting a prepreg pasting state.
- As publicly known, laminated bodies of prepreg (for example, carbon prepreg) that are fired are used in fuselages of automobiles and airplanes.
- The prepreg laminated bodies are constituted so that a plurality of prepregs is arranged in parallel on pasting target bodies by using a laminating apparatus. The pasting target bodies are usually molds or prepreg laminated bodies laminated on the molds.
- However, even when prepregs are automatically pasted by the laminating apparatus, the defect in pasting of the prepregs is occasionally occurred. For this reason, as described in
Patent Document 1, for example, in parallel with the pasting of the prepregs, states of gaps between adjacent prepregs are inspected. - Concretely,
Patent Document 1 discloses that while light is being emitted obliquely to side ends (edge portions on sides where the gaps to be inspected are formed) of adjacent fiber-reinforced plastic tapes (corresponding to prepregs), the side ends are imaged by cameras, and distances between the edges are detected based on the obtained image data, and the states of the gaps are determined. - Patent Document 1:
JP 2011-104905 A - However, in a case of the method disclosed in
Patent Document 1, since edges of prepregs should be detected with it being irradiated directly with light, if gaps between the adjacent prepregs are narrowed, accuracy in detection of the gaps is deteriorated. - In order to solve such a problem, therefore, the following prepreg laminating apparatus is considered.
- Concretely, as shown in
Figs. 1A to 1C , alaminating apparatus 1 is provided with alaminating head 11, and apasting roller 12 that is integral with the laminatinghead 11. While the laminatinghead 11 is being moved along apasting target body 3,prepregs 4 are sequentially pasted to thepasting target body 3 by thepasting roller 12. - As shown in
Fig. 1C , thelaminating apparatus 1 is provided with a pastingstate inspection apparatus 2 having alaser 21 as an illumination unit and acamera 22 as an imaging unit. Thelaser 21 and thecamera 22 move integrally with the laminatinghead 11. The inspection using the pastingstate inspection apparatus 2 is carried out on aprepreg 4 which is being pasted and adjacent pastedprepreg 4. The inspection may be carried out on theadjacent prepreg 4 that has been pasted. - As shown in
Fig. 2 , the laser (the line laser) 21 emits slit light LA along an inclined plane so that a pattern X of the slit light LA are formed across theadjacent prepregs 4. In the case ofFig.2 , the projected pattern X is composed of projected lines L1 to L3. In such a manner, when a gap G is present between theprepregs 4, a level difference facing a longitudinal direction of the prepregs (pasting advancing direction) is formed between the projected lines L1 and L2 formed on theprepregs 4 and the projected line L3 formed on thepasting target body 3 corresponding to the gap G. The size of the level difference depends on a thickness of theprepregs 4 and an incident angle of the slit light LA. For this reason, when an irradiation region formed with the projected lines L1 to L3 is imaged by thecamera 22 from above, image data shown inFig. 3 can be obtained. A determination is made whether a distance A of the gap G detected based on the image data is within an allowance, so that the pasting states of theprepregs 4 can be accurately inspected. For example, when the gap distance A is within the allowance, the pasting of theprepregs 4 continues, and when not, the pasting of theprepregs 4 is suspended. Herein, it is preferable that the slit light LA is emitted so that the projected lines L1 to L3 are formed along a direction perpendicular to a longitudinal direction of theprepregs 4. - However, even such a pasting
state inspection apparatus 2 has the following problem. - That is to say, the
pasting target body 3 is composed of not only aplane portion 31 but often of acurved portion 32 according to a shape of a tail unit of an airplane or the like as shown inFigs. 1A and 1B . When a shape changed portion such as thecurved portion 32 is present, this causes an adverse effect on the imaging state of thecamera 22, and thus the inspection accuracy in the pasting states of theprepregs 4 is deteriorated. - In view of the above circumstance, a technical problem of the present invention is to accurately inspect pasting states of prepregs even when a pasting target body to which prepregs are pasted has a shape changed portion such as a curved portion.
- The present invention that is devised in order to solve the above problem is a prepreg pasting state inspection apparatus, for inspecting a gap between prepregs adjacent on a pasting target body having a shape changed portion, including an irradiation unit for emitting slit light along an inclined plane so that a projected pattern of the slit light is formed across the adjacent prepregs, an imaging unit for imaging an irradiation region of the irradiation unit, a determination unit for determining whether the gap between the adjacent prepregs is within an allowance based on a signal from the imaging unit, a distance measurement unit for measuring a distance between a reference position and the irradiation region, and a focus adjusting unit for adjusting a focus position of the imaging unit based on the signal from the distance measurement unit.
- With such a constitution, the distance measurement unit measures a distance from the reference position to the irradiation region (for example, surfaces of the prepregs, or a surface of the pasting target body corresponding to the gap between the prepregs). For this reason, when the focus adjusting unit successively adjusts the focus position of the imaging unit, even if the shape changed portion is present in the pasting target body, the projected pattern formed across the adjacent prepregs can be accurately imaged and the gap between prepregs adjacent can be accurately detected. Therefore, the pasting states of the prepregs can be accurately inspected.
- With the above embodiment, the imaging unit may have a movable lens that is capable of moving close to or separating from the irradiation region, and the focus adjusting unit may have a driving unit for moving the movable lens based on the signal from the distance measurement unit.
- In such a manner, a focus position of the imaging unit can be easily adjusted according to movement of the movable lens. When the entire imaging unit is moved close to or is separated from the irradiation region, the focus position of the imaging unit may be adjusted.
- In this case, it is preferable that the driving unit is an ultrasonic motor.
- In such a manner, the focus position of the imaging unit can be adjusted finely and quickly. Further, the apparatus can be miniaturized.
- It is preferable that the above constitution has a second focus adjusting unit for adjusting a focus position of the irradiation unit based on a signal from the distance measurement unit.
- That is to say, when the shape changed portion is present in the pasting target body, this causes an adverse effect also on irradiation conditions of the irradiation unit (a width and lightness of the projected pattern fluctuate). For this reason, it is preferable that the focus position of the irradiation unit is adjusted like the above constitution.
- In the above constitution, it is preferable that the irradiation unit is retained in a moving body that can move close to or separate from the irradiation region, and the second focus adjusting unit has a second driving unit for moving the moving body based on a signal from the distance measurement unit.
- In this case, it is preferable that the second driving unit is an ultrasonic motor.
- In such a manner, the focus position of the irradiation unit is adjusted finely and quickly, and the apparatus can be miniaturized.
- It is preferable that the above constitution has a light amount adjusting unit for adjusting an amount of light incident on the imaging unit.
- As a result, since the imaging unit can always observe an approximately same amount of light, so-called blown out highlights (overexposed state) can be prevented from occurring on data observed by the imaging unit due to an excessive amount of light. For this reason, the gap distance between the adjacent prepregs can be stably measured. Particularly, such a constitution is effective for the case where the shape changed portion is present in the pasting target body. This is because a direction of reflection light (for example, total reflection light) of light emitted from the irradiation unit changes on the shape changed portion, and the amount of light incident on the imaging unit is likely to fluctuate.
- In the above constitution, it is preferable that the light amount adjusting unit is composed of at least one of an output adjusting unit for adjusting an output of the slit light emitted from the irradiation unit, a shutter speed adjusting unit for adjusting a shutter speed of the imaging unit, and an iris adjusting unit for adjusting an iris of the imaging unit.
- That is to say, (1) when the output adjusting unit adjusts the output of the slit light, an amount of reflection light that causes an adverse effect on imaging can be adjusted. For this reason, when strong reflection light is predicted, the output of the slit light may be suppressed. (2) When the shutter speed of the imaging unit is adjusted by the shutter speed adjusting unit, time at which the light is incident on the imaging unit can be adjusted. For this reason, when strong reflection light is predicted, the shutter speed may be heightened. (3) When the iris of the imaging unit is adjusted by the iris adjusting unit, an amount of light indent on the imaging unit can be adjusted according to a narrowing-down level of the iris. For this reason, when the strong reflected light is predicted, the iris may be narrowed down. When any one of (1) to (3) is employed, the constitution can cope with a fluctuation in the amount of light incident on the imaging unit. However, (1) to (3) are suitably combined so that the constitution is compatible with the fluctuation in the amount of light more securely.
- It is preferable that the above constitution is provided with a depth of field adjusting unit for adjusting a depth of field of the imaging unit.
- As a result, imaging accuracy of the imaging unit can be prevented from being deteriorated on a position corresponding to the shape changed portion of the pasting target body. Examples of the depth of field adjusting unit include the iris of the imaging unit (for example, an electromotive iris), and a zoom mechanism (for example, electromotive zoom) if it is provided to the imaging unit. In this case, when the iris is narrowed down or the zoom mechanism is adjusted to a wide-angle side, the depth of field is deepened (deep-focus), thereby preventing the imaging accuracy of the imaging unit from being deteriorated on the shape changed portion.
- According to the present invention, even when the pasting target body to which the prepregs are pasted has the shape changed portion such as the curved portion, the pasting states of the prepregs can be accurately inspected.
-
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Fig. 1A is a conceptual diagram illustrating one example of a prepreg laminating apparatus. -
Fig. 1B is a conceptual diagram illustrating a condition of a prepreg pasting work using the laminating apparatus. -
Fig. 1C is a conceptual diagram illustrating one example of a prepreg pasting state inspection apparatus mounted to the laminating apparatus. -
Fig. 2 is a conceptual diagram illustrating a condition of the inspecting work using the pasting state inspection apparatus shown inFig. 1 . -
Fig. 3 is a conceptual diagram illustrating one example of image data captured by an imaging unit (a camera) in the condition ofFig. 2 . -
Fig. 4 is a conceptual diagram illustrating the prepreg pasting state inspection apparatus according to a first embodiment of the present invention. -
Fig. 5 is a perspective view illustrating the prepreg pasting state inspection apparatus according to the first embodiment of the present invention. -
Fig. 6A is a diagram illustrating inspection conditions in an early state by means of the prepreg pasting state inspection apparatus according to a second embodiment of the present invention. -
Fig. 6B is a diagram illustrating inspection conditions in a middle state by means of the prepreg pasting state inspection apparatus according to a second embodiment of the present invention. -
Fig. 6C is a diagram illustrating inspection conditions in a late state by means of the prepreg pasting state inspection apparatus according to a second embodiment of the present invention. - An embodiment of the present invention will be described below with reference to accompanying drawings. Since items relating to
Figs. 1 to 3 described already are similar, detailed description is omitted. - As shown in
Fig. 4 , a prepreg pastingstate inspection apparatus 2 according to a first embodiment of the present invention is provided with alaser 21 as an irradiation unit, acamera 22 as an imaging unit for imaging an irradiation region of thelaser 21, acontrol unit 24 as a determination unit for determining whether a gap S (gap distance A) betweenadjacent prepregs 4 is within an allowance based on a signal from thecamera 22, and arange sensor 23 as a distance measurement unit for measuring a distance from a reference position to the irradiation region. The drawing, for convenience, illustrates thecamera 22 and therange sensor 23 being adjacent to each other in a pasting advancing direction of theprepregs 4. Actually, however, both of them are arranged adjacently in a direction perpendicular to the pasting advancing direction of theprepregs 4, in other words, a widthwise direction of theprepregs 4 as shown inFig. 5 . - As the
range sensor 23, a light wave type or sound wave type range sensor can be employed. A difference between the distance measured by therange sensor 23 and an actual distance from thecamera 22 to the irradiation region is given in advance as a correction function. Similarly, a difference between the distance measured by therange sensor 23 and an actual distance from thelaser 21 to the irradiation region is given in advance as a correction function. The irradiation unit is not limited to thelaser 21, and thus illumination such as LED for emitting incoherent light can be employed. - The
control unit 24 is provided with a firstfocus adjusting unit 25 for adjusting a focus position of thecamera 22 based on a measurement signal from therange sensor 23, and a secondfocus adjusting unit 26 for adjusting a focus position of thelaser 21 based on the measurement signal from therange sensor 23. - The
camera 22 contains a motor (for example, an ultrasonic motor) 27 for moving a movable lens, not shown, back and forth with respect to an optical axis direction. - The
laser 21 is mounted to a movingbody 29 that moves up and down on arail 28 extending to an up-down direction. The movingbody 29 is driven by a motor, not shown (for example, an ultrasonic motor). The movingbody 29 may be supported at a forward end of a cylinder expanding and contracting in the up-down direction. - The first
focus adjusting unit 25 drives amotor 27 built in thecamera 22 based on the distance measured signal input from therange sensor 23, and moves the movable lens of thecamera 22 back and forth in the optical axis direction. As a result, the focus position of thecamera 22 is automatically adjusted according to the distance measured signal from therange sensor 23. - On the other hand, a second
focus adjusting unit 26 drives a motor connected to the movingbody 29 based on the distance measured signal input from therange sensor 23 so as to move thelaser 21 back and forth integrally with the movingbody 29. As a result, the focus position of thelaser 21 is automatically adjusted according to the distance measured signal from therange sensor 23. - Therefore, even when a shape changed portion such as a
curved portion 32 is present in a pasting target body (the mold or a prepreg laminated body) 3, the focus positions of thelaser 21 and thecamera 22 are properly adjusted. For this reason, the image data shown inFig. 3 can be securely obtained. Therefore, the pasting states of theprepregs 4 can be accurately inspected without being affected by the shape changed portion of thepasting target body 3. - The prepreg pasting
state inspection apparatus 2 according to a second embodiment of the present invention is different from the first embodiment in that a light amount adjusting unit for adjusting an amount of light incident on thecamera 22, and a depth of field adjusting unit for adjusting a depth of field of thecamera 22 are provided. Only that different point will be described below. - The light amount adjusting unit is composed of at least one of an output adjusting unit for adjusting the output of the slit light emitted from the
laser 21, a shutter speed adjusting unit for adjusting the shutter speed of thecamera 22, and an iris adjusting unit for adjusting the iris of the camera. The light amount adjusting unit adjusts the amount of light incident on thecamera 22 so that the amount of light becomes approximately constant. - The depth of field adjusting unit is composed of at least one of the iris adjusting unit for adjusting the iris of the camera, and a zoom adjusting unit for adjusting a zoom of the camera. Even if the shape of the
pasting target body 3 changes, the depth of field adjusting unit adjusts the depth of field of thecamera 22 so that the projected lines L1 to L3 can be clearly observed. - As a result, even when the
curved portion 32 is present in thepasting target body 3, occurrence of defects such as blown out highlights and defocusing can be prevented. For this reason, the gap between theadjacent prepregs 4 can be accurately inspected. - The light amount adjusting unit and the depth of field adjusting unit change the adjusting amounts in the following manner, for example.
- That is to say, as shown in
Figs. 6A to 6C , the adjusting amounts by means of the light amount adjusting unit and the depth of field adjusting unit are stored in advance according to a tilt angle θ of thepasting target body 3. - In the second embodiment, the tilt angle θ is set to an angle that is formed by a line segment P1P2 and a horizontal line. P1 is an intersection point between a perpendicular line drawn from the
camera 22 and surface of the pasting target body 3 (or the prepregs 4). P2 is a lowest point on an outer periphery of thepasting roller 12. In the drawing, since a relative position relationship between thepasting roller 12 and thecamera 22 does not change, M and L are known in advance. Further, L1 is successively detected based on the measured results of therange sensor 23. Therefore, the tilt angle θ is obtained according to the following formula; - In the case of
Fig. 6B (the plane portion), since L1 is equal to L, θ becomes zero. On the other hand, in the case ofFig. 6A , since L - L1 is more than zero, θ obtains a positive value. In the case ofFig. 6C , since L - L1 is less than zero, θ obtains a negative value. A tilting direction of thepasting target body 3 can be determined based on the positive or negative value of θ. - While θ is being calculated in such a manner, the adjusting amounts of the light amount adjusting unit and the depth of field adjusting unit are changed according to a change in θ.
- More concretely, in the case of
Fig. 6A , since the slit light emitted from thelaser 21 is incident on the surface of the pasting target body 3 (or the prepregs 4) at a shallow incident angle, reflection light R does not incident directly on thecamera 22. In the case ofFig. 6B , the slit light emitted from thelaser 21 is incident on the surface of the pasting target body 3 (or the prepregs 4) gradually at deeper incident angles, but the reflection light R is unlikely to be incident directly on thecamera 22. On the contrary, in the case ofFig. 6C , since the slit light emitted from thelaser 21 is incident on the surface of the pasting target body 3 (or the prepregs 4) at a deep incident angle, the reflection light R might be directly observed in thecamera 22. For this reason, as shown inFigs. 6A to 6C , as θ changes, the light amount adjusting unit narrows down the light amount and adjusts the amount of light so that it is approximately maintained in the same level in all the states ofFigs. 6A to 6C . On the other hand, the depth of field adjusting unit sets the depth of field as deep as possible so that the projected lines L1 to L3 (seeFig. 2 ) of the slit light can be clearly observed in the states ofFigs. 6A to 6C . In the second embodiment, the depth of field is constant inFigs. 6A to 6C , but the depth of field may be changed according to the change in θ. - In practical use, it is occasionally requested to repeat the work for pasting the
prepregs 4 to a plurality ofpasting target bodies 3 belonging to the same kind at a speed of 1 m/s or more. In this case, when the adjusting amounts are tried to be changed by the light amount adjusting unit and the depth of field adjusting unit while θ is being calculated, it might be difficult to respond the request with for example, photographing of 30 frames/second (1 frame: 33 ms). - Therefore, in this case, when the work for pasting the
prepregs 4 to one kind of thepasting target bodies 3 is repeated, theprepregs 4 are pasted to the firstpasting target body 3 at a low speed of, for example, about 0.5 m/s (half of the normal pasting speed). A relationship between θ and the adjusting amounts by means of the light amount adjusting unit and the depth of field adjusting unit is stored (recording (teaching) step). As to the subsequent same kind of thepasting target bodies 3, the light amount adjusting unit and the depth of field adjusting unit are operated in the basis of the adjusting amounts stored in advance. - Since numerical value control (NC) data used for pasting the
prepregs 4 to thepasting target body 3 is stored in alaminating apparatus 1, the NC data is used instead of θ so that the adjusting amounts of the light amount adjusting unit and the depth of field adjusting unit may be changed. That is to say, when three-dimensional data (or altitude data representing the surface) representing the surface of thepasting target body 3 is present, this may be used instead of θ. - The present invention is not limited to the above embodiments and can be carried out in various forms. For example, the first embodiment describes the case where the movable lens of the
camera 22 is moved, but theentire camera 22 may be slid to the optical axis direction so that the focus position is adjusted. - The above embodiments describe the case where the pasting
state inspection apparatus 2 is integral with thelaminating apparatus 1, but they may be constituted separately. -
- 1
- prepreg laminating apparatus
- 11
- laminating head
- 12
- pasting roller
- 2
- prepreg pasting state inspection apparatus
- 21
- laser
- 22
- camera
- 23
- range sensor
- 24
- control unit
- 25
- first focus adjusting unit (for a camera)
- 26
- second focus adjusting unit (for a laser)
- 3
- pasting target body
- 4
- prepregs
- X
- projected pattern
- L1, L2, L3
- projected line
- LA
- slit light
- S
- gap
- A
- gap distance
Claims (7)
- A prepreg pasting state inspection apparatus for inspecting a gap between prepregs adjacent on a pasting target body having a shape changed portion, comprising:an irradiation unit for emitting slit light along an inclined plane so that a projected pattern of the slit light is formed across the adjacent prepregs;an imaging unit for imaging an irradiation region of the irradiation unit;a determination unit for determining whether the gap between the adjacent prepregs is within an allowance based on a signal from the imaging unit;a distance measurement unit for measuring a distance between a reference position and the irradiation region; anda focus adjusting unit for adjusting a focus position of the imaging unit based on the signal from the distance measurement unit.
- The prepreg pasting state inspection apparatus according to claim 1, wherein
the imaging unit has a movable lens that is capable of moving close to or separating from the irradiation region, and
the focus adjusting unit has a driving unit for moving the movable lens based on the signal from the distance measurement unit. - The prepreg pasting state inspection apparatus according to claim 1 or 2, further comprising a second focus adjusting unit for adjusting a focus position of the irradiation unit based on a signal from the distance measurement unit are provided.
- The prepreg pasting state inspection apparatus according to claim 3, wherein
the irradiation unit is retained in a moving body that can move close to or separate from the irradiation region, and
the second focus adjusting unit has a second driving unit for moving the moving body based on the signal from the distance measurement unit. - The prepreg pasting state inspection apparatus according to any one of claims 1 to 4, further comprising a light amount adjusting unit for adjusting an amount of light incident on the imaging unit is provided.
- The prepreg pasting state inspection apparatus according to claim 5, wherein the light amount adjusting unit is composed of at least one of an output adjusting unit for adjusting an output of the slit light emitted from the irradiation unit, a shutter speed adjusting unit for adjusting a shutter speed of the imaging unit, and an iris adjusting unit for adjusting an iris of the imaging unit.
- The prepreg pasting state inspection apparatus according to any one of claims 1 to 6, further comprising a depth of field adjusting unit for adjusting a depth of field of the imaging unit.
Applications Claiming Priority (1)
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JP2012016944A JP5805550B2 (en) | 2012-01-30 | 2012-01-30 | Pre-preg sticking state inspection device |
Publications (2)
Publication Number | Publication Date |
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EP2620269A1 true EP2620269A1 (en) | 2013-07-31 |
EP2620269B1 EP2620269B1 (en) | 2014-07-23 |
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EP13153052.9A Active EP2620269B1 (en) | 2012-01-30 | 2013-01-29 | Prepreg pasting state inspection apparatus |
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US (1) | US9279678B2 (en) |
EP (1) | EP2620269B1 (en) |
JP (1) | JP5805550B2 (en) |
CA (1) | CA2803568C (en) |
Cited By (5)
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DE102015104612A1 (en) * | 2015-03-26 | 2016-09-29 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Apparatus and method for determining the tackiness of preimpregnated semifinished fiber products |
DE102015017131A1 (en) | 2015-03-26 | 2016-09-29 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Apparatus and method for determining the tackiness of preimpregnated semifinished fiber products |
DE102015008313A1 (en) * | 2015-06-30 | 2017-01-05 | Airbus Defence and Space GmbH | Device and method |
DE102015122026A1 (en) * | 2015-12-16 | 2017-06-22 | Automation Steeg & Hoffmeyer Gmbh | Apparatus and method for composing fiber-plastic composites with high application rates |
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JP6241935B2 (en) * | 2014-02-12 | 2017-12-06 | 東レエンジニアリング株式会社 | A device to inspect the application state of fiber reinforced plastic tape |
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DE102015104612A1 (en) * | 2015-03-26 | 2016-09-29 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Apparatus and method for determining the tackiness of preimpregnated semifinished fiber products |
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CN113566703A (en) * | 2021-07-15 | 2021-10-29 | 上海自动化仪表有限公司 | System for measuring actual position on square platform and position calculation method |
CN113566703B (en) * | 2021-07-15 | 2024-05-03 | 上海自动化仪表有限公司 | Actual position measurement system and position calculation method on square platform |
Also Published As
Publication number | Publication date |
---|---|
US9279678B2 (en) | 2016-03-08 |
EP2620269B1 (en) | 2014-07-23 |
CA2803568C (en) | 2019-08-20 |
JP5805550B2 (en) | 2015-11-04 |
JP2013154541A (en) | 2013-08-15 |
US20130194415A1 (en) | 2013-08-01 |
CA2803568A1 (en) | 2013-07-30 |
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